/Engine/Source/Runtime/HeadMountedDisplay/Public/IHeadMountedDisplay.h
Return a pointer to the SpectatorScreenController for the HMD if supported, else null. The controller is owned by the HMD, and will be destroyed when the HMD is destroyed.
virtual [ISpectatorScreenController](API\Runtime\HeadMountedDisplay\ISpectatorScreenController) * GetSpectatorScreenController()